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From: Mateusz Viste <mateusz DOT viste AT delorie DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Using outportb() with djgpp
Date: Thu, 10 Jul 2014 22:20:13 +0200
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi,

I am trying to write to a hardware port from within djgpp, using 
outportb(). It does work from time to time, but often outportb() will 
make the whole PC reboot. Specifically I am writing to port 0x330 (to 
a MPU401 adapter). If using the same code with turbo C, it works 
perfectly. Hence I am wondering: are there any special "rules" I 
should be aware of when trying to outportb() from within protected 
mode?

regards,
Mateusz